Portable telephone



FIG. 1 is a top and front perspective view of a portable telephone having an extended antenna;

FIG. 2 is a front view of a portable telephone having a retracted antenna;

FIG. 3 is a side view;

FIG. 4 is a rear view;

FIG. 5 is another side view;

FIG. 6 is a top plan view; and,

FIG. 7 is a bottom plan view. 

The ornamental design for a portable telephone, as shown and described. 